As per this article just announced on Variety.com:
New Line Cinema has acquired worldwide distribution rights to “Batkid Begins: The Wish Heard Around the World,” as well as the rights to adapt the documentary into a narrative film.I'm so excited and happy for the incredible crew and Mazel Tov to Dana, Liza, Ian, Kurt and the rest of the wonderful people who so perfectly captured the spirit of the Batkid wish in San Francisco, and the spirit of community service that us "cast" of Batkid day really believe in. So excited that this message will be spread!
Read more here on Variety:
and on The Hollywood Reporter: